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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd8de5f1c6ec9ba572ad2af6d94492c3048baa817f4a3abcced97f5cb0942f1' 
  AND token = 'RGFgW+v1gIv0nmaKKrvC8/4on0pFjMMPWFtI7T2bzqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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