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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86fa31cb8c2709d63a4f6ee1787a3af859da4669cd0603d5f05ba585315372f' 
  AND token = 'ecTZSevMEy3l2E86CbooA0DLhQ2t23RtNiD068t040U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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