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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3660626f1fb9cf646e1a1217cc3336761a64db9cb9f9b2efed5049db8434a1e7' 
  AND token = 'fj308KnYm8cUCFPRxP4IUZu5BMm+XC9fEoZQT0InNXI=' 
  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"
    }
  }
}