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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a44a94ec132ad48f8dd5e38588843b8f3458148bb5444dfd2764fb7d6905ca' 
  AND token = 'Uwt1JIrVN/JnW5T1iJQD1kJjSglPMHNgAqBnqeFCkJs=' 
  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"
    }
  }
}