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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4272da156f399972ace6c1448ec531a9993c9c1159f2c1ff9334a286ce83ac92' 
  AND token = 'HVeFbiDKIX6tP9KMYQVSWF0340sA6WeCuQu2rYmt8SU=' 
  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"
    }
  }
}