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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f0bca7fbb5d4c322203c81bd57325c63050dca11f43a2d4bf0f382b98f3de1' 
  AND token = 'wVggZdx87Ooa3b8CVVQPVEGNO7Y0Qxb5wPzplrY3jPI=' 
  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"
    }
  }
}