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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd472e7132422a62e0c47b062e517eac6eb0c2a246b6c27b6ab1478d65e4ae723' 
  AND token = 'KWXkA4v3P1HTH5gvkVg3RZ4rQi1uf+vTGRtUpmymKCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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