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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91934c781dfb12699b6aa095793bc78e5e6657f708512031cb5aa20b1274e3f' 
  AND token = 'd3Pu64S+aEP/dCE5tqCksNnSIZQb7qsEW7Pv4Ev/AW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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