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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a22063641cbc3852bb67a29a07a881c815cdbaf540a2b4b51702ff56d6cbbf30' 
  AND token = 'SNhL8vG8SOwM5KiV/Ma/dqGHdbFtH7jvQzzu1mvjyP0=' 
  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"
    }
  }
}