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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17008ae98fa6582ba5e7573503ad0f5035a4b7372a60eb847c30863af6fad664' 
  AND token = 'Iaq0W6Y1q4CRRV7/Q8/SDuT42LR28Kbt2d2x0W57W+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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