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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99b6efa153646abea8d8d9aefb3d0c4c34260e9bf658fe299e2f520b76f36ea' 
  AND token = 'daOS2Z8Su20oH3vb/fJEy41HI5Gxt5wFipCqE815QUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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