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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0016981099c3db091e838b1f51c572eda1625fc52a437452f2e3ff88b7c8a776' 
  AND token = 'KEeWvAxser7SnQX62Do2U5OegrwOjyjBjROzOyJkm6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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