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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d2fe87c3bed5075087ac0925292c215d275b6e5e94476d6460a8a3eaf8f461' 
  AND token = 'rgEhF+B9ey02L9PQqp0V24eYkOA0mHCIKUGHOByPMNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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