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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb64a6fda92d3185937e9216eb9e209cb8b67d9ed87a5d455c42ef0d3cd0bce' 
  AND token = 'q2ub+7y63My/19ew+6GUksvrHc6xskAi1I4u1xT9V88=' 
  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"
    }
  }
}