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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ea822e6b0edf5a94bab49de371bf0862152460506c65b58ca0f9532e0e0b97' 
  AND token = 'WN30XGktD1VrErdE83CmHXxJkmCyKZfieVSlNK4AZ+s=' 
  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"
    }
  }
}