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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6324b9249c6a7d3d4587ee25ed918582c5eb632836fd5780a18677bb1755dc' 
  AND token = '3kN4nYVEo8x2SXylLotUF1lkCVu62Yglm4EavlIdbQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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