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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f2f9b7e2877cfc62db00ead3db7e06bf3137934c1ce42019a880dcf290aba6' 
  AND token = '3m2BEYuXXZszvrBtNC9tbDn+IKm1Nqt3cuN6faOJtFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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