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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df00c8014ac334b0da44e9de8084645a2823e5ca77765c21d9859d7e981f65a' 
  AND token = 'wzan7V51bK0hmn3l60su0Tpmb0VUTgxelwLeDCCHC/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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