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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a64072c3fcbcd12ea919f6b6d7ed09a9c89d60fa3fb540f1c4adea7d66ca6e88' 
  AND token = '54d99D+trviNRktebQKt7fP8V4+T00OhAocbUyeJzQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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