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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8665929c7ed769035c57f7643d7c91e7653e7f8fb885d390a4be5ec554e7919' 
  AND token = 'G8I4tthMZpRbyYNhPEd6NU6Mt9wYOws3pKCrwZnTwmo=' 
  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"
    }
  }
}