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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05118582d9038806b69e256942d63380780121e390be71780225fdc4e1f369b' 
  AND token = 'dqRTM9M9Fj6ybX2DBcqzDWpxXyJsU928CsgQgPj4sPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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