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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ca59b545f2fbe8f392955bfe581613c6e6bb69f4904b76875562d1e98c95e7' 
  AND token = 'X8SZxXGE7ManR071JHVC6aibyTlC4qGcvbhtXzyopZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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