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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39bc88ae08cc36c527f7ad104876b4806a52f89054324757124d17ea2b1b29b' 
  AND token = 'xla6eQZa0Z63j6tJV+rEIRuE7RhkRI2zv2r3lFqrZ5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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