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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13e03c325fe81e7cd7970f27de63700a89d840a60f2fb770856a8d92d12ecd9' 
  AND token = '7r7qxD99fwamV2m4Fu4icbf81TIenkgQs//uubgKr04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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