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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160ac2d252b939f1e25b313d648bc50757ae83c282f1a76ab3bc30580b76366b' 
  AND token = 'qvFs2Ty7FfiK2JO4nQQn0BiK4s50nlMhh+jvl5dRiLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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