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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658bca131944befcf84c6124a1898b57651f6142ec0903f3f1c17630c6a64645' 
  AND token = 'gI1wcTpd3UxZMuGkucAHVf24x5c/lm9+GnZI0P9WMVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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