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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899ef0a17d7b637ea03f051f7a5db34a9c457005d15b7bf207b123b73f1d7611' 
  AND token = 'G/XFUG6vC/biwcL76n6cNtTufHS75EUnJlCCD0oIWSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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