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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207f3f13e931e1a63ae7db6df66c773c3b40098898fb63171796d6316fdc2ea3' 
  AND token = 'eYBQZLyiGQN8Bi6cEwA2bHeii76aYbNEvQzvu7x05+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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