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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc84136a2d5187197ec35dfc4e04e96cbade3ed7c3d0be939ee37b696ff6d84f' 
  AND token = 'sWN1F0wZi3gjpovYwQePNJPPzUObj1ha+583S5B7CWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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