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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52316666daae2d246e430f7e5b9b11565c7b1dc074b841c9e00fab44d536e8f3' 
  AND token = 'Q/7QZipO9ivuz3lrb6L61nLPjF0lJxfchOZOs6H/1aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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