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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13c60bd9fee5af757c0d55a2a1046923aab93c25c8fa2bbeafd94aa8cdf2148' 
  AND token = '+tRNsrP6FU0mank1I3yi0c3TU3wp1fNSjD9ZJbhgfMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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