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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9d628dcad1ea29e7dc73aa6e6495d7b2bebeab00f23b614e7fb492f7afb285' 
  AND token = 'OuoSQ6T8kbFzlAQZ6jFGURnFCNA7PiERp4hFT/ALzfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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