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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a51a5a72a8934c324dfd9f78084c3b34bf73b100dc75d4057282a745b1f6f9a' 
  AND token = 'Yxz0NOSnZzt1/zbpqCe5mGTO5LQS1tmVyl7s0K4uRX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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