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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e449e9bd8733203c14e7a8f0de3605fd2777a3832064ae0946385b828def90e8' 
  AND token = 'S50jG86ZsjsgtJN7sCPsXhI4w0blovy/quof/WYM8w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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