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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80e4b60157b44b165a12bda9b68ebb359d2f31bff43400590771a2ff94357b71' 
  AND token = 'k2Tc9qmzwV4avSWZ4HfhSE3WaL8uhXMmAkwL7RuaV0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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