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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0dbd5da9171eedb1d4224c793e1c5ac55a440aa64a45a1c9019a2a50266aa6a' 
  AND token = 'Z++Wo/UsOEFRUbDRAjkc+eFR45gacNgFwKDDUJU5c8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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