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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f13dc78e219e1c4bd519afeb8b0c39d7cacadc97f588ae6e0a87025d2a2b9c' 
  AND token = 'kVfENzeYuKS2PFh/VOjrwTVF3EBJqyA1f96iQ7quH/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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