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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1cc5f7b221d8ca532e20c8b5315a223f98b170d1a9801059249315bfca6397' 
  AND token = '35uAuIHjk2uXd3O3R9722wQvm7qgVcLPYnyN9BTXSZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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