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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e52cc18920a406248a75978001ffa5d5cb61ea1dc7f2609e3b28ac0cbf94ba' 
  AND token = '6h7IAMQa650kn+Je5K7hB5PVan+3csq1SAnH1dM9Dwo=' 
  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"
    }
  }
}