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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3300e3ed1f9bab81fdb25d21a0237e146bdf96b7b465e020dd4dd65996a3b7e3' 
  AND token = 'BFhGPYeAGx4o5+u1W27IeQSyfQqmXAt1QR0EeWJl60w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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