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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ad36f3a6dc6a4e83df42b1e76bf264b1b54995b075fc68b2afc8abb09b8d21c' 
  AND token = '09YXD1HY781rylvPPxqvwXJMweWE/b7y1p59SYpL124=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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