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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997cfb5f3384b342928e651463421852f4d459aa35e07b564eb0be93fca0686e' 
  AND token = 'ceQqjJRU5CE9nUdKPWcoXbR7d60lMUG3n9hyqYme1I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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