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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a6030ad26d3eb3d1b7432b733380b443c1624f83e236ab80f595dbddca7ab3' 
  AND token = 'A9hQS33Lo3iPvDmt3EeKOg0s769/u6y8XNncpM/k4Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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