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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523a839c9ad1b56dc669d1449949a81791dc6b00d697145772cfa26d03a67cf4' 
  AND token = 'uLacTct8b4Iuj5mCIgsVoXbN5UrHDDaOLHQ6xEKXGWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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