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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036e14f48a79d32dde8ed970728c356b73d9db381020eec3ab7db7ac31af23f3' 
  AND token = 'aCXzqQn3XZNBulMU/+ggMzGZ4pM6PB0MXTIcBuGO4gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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