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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce2918968c45e389f7508126b9a571b4bbde9f4d3c70921a6dcaa90fdb8cd63' 
  AND token = '8Iyvr8sBHfbqXBsTfz9DeJ6o9/sY5bjqSUVBl8bcehg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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