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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90756b09a4cf4e783c6a994a3b780f0be17f6821864f136516b99512c162c0f1' 
  AND token = 'vbK/f79yB5+EgrB7UDkMYyV44+z+bFIfz2r42GuUmDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}