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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becbb19096c0a388bd3c92c1ac568e7fdccf8352ea2c10af43382839b7e6d346' 
  AND token = 'LholE2glv8Gol0y4UW8nOFvwdYEK/wVW6hcjv5WCCy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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