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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a90780613b5291bd31711b6a8e2380f190c0539b045dd5db7028f5541e6324d' 
  AND token = 'hax3h4NDKIiKQbsftnW6z1+/wLdKW7M1a7lqNrd+N94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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