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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23e9725a3fb88ea4e422f7b5046f2e17f60289c27f584332f4cb06b08dd9a3d' 
  AND token = 'gxmNbxAn8LBc67z/NnM2eD7SdORHT26s2XiQVqqzTpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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