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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af38fdd4a274b63f5ec79d14d4551f93d9aafe0e719e6eddeb26d4a837378987' 
  AND token = 'Uy/A1xnII0tWXhYb8ojUFK2W7vwYaDcGvN17wBICwDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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