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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7c92fa461f0d8265de3035d8c0e3de3ffa63e9863554c409f68677f7fa9bc1' 
  AND token = 'ESUUYbB7e3ZXQfjcBsWydI8nn8++hdJX6r2X6s9oZ/Q=' 
  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"
    }
  }
}