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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6314a1cfc05c6cee933ae224fd6943131a2564432ca6d6e8adc15b3462a5a634' 
  AND token = 'WpgA8oNt+0dq9C8m09dgzsW1DZjGu3NUrpF17D1K1ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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