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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21c6e5d514ac6e39ab94d17d2f146ff5a08052968c26e9374614374f317342f4' 
  AND token = 'lBTZUOS/pEucg4mXXJ0yC4Iibfpq/ayxxq6ZKheo05E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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