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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef96a47f621e2de372eef13951cbd3496e51c46af10d64606de1330eb043830' 
  AND token = '1s0huN/LX+T865VVynMPmtukisxBq/kEcWw0fT0Epmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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