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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd69037dbd9ba8cd18dac3c954adc690b3b0d08d6ec28e13d25d5618ae0d29a' 
  AND token = 'BaMGRxU3taWpyUcgWYLOYl4uUw2IBs7G9oW2xzYN5e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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