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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88662d96c0a9802c4c317dfa9ee5e53da90ac96a3ac8028b4ebc511685345ad4' 
  AND token = 'pRAn3wmEfSojyKFStgEa43PMG2WYwDOyxRcipWZDLGo=' 
  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"
    }
  }
}