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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e56f1bf3b8c77abd2bdee72ae6b365fd9e77bf3b9de832afaf3940f1a8e05b' 
  AND token = '6VCWmp9hRjABoX7UZTmh8XBwOZtbGO5ipPoJmTBzZAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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